Figure 2.

Boosting of antibodies after influenza vaccination. Influenza vaccine antigen binding antibody titers were measured by ELISA before and 14 d postvaccination in individuals who had been vaccinated the previous year (annual), and those who had skipped influenza vaccination for at least 3 years (skipped). (A) The relationship between the pre- and postvaccination antibody titers. (B) The relationship between fold increase in antibody titers and prevaccination titers. (C) A schematic outlining how preexisting MBCs and antibody titers may affect the recall response after seasonal influenza vaccination.